using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Practices.Common;
using EnvDTE;
using System.ComponentModel.Design;
using VSSDKAssist.Assets.Helpers;
using EnvDTE80;
using VSSDKAssist.Assets.ValueProviders.Base;
using System.Globalization;

namespace VSSDKAssist.Recipes.CreateVSCommand
{
	/// <summary>
	/// Value provider for a hex random number
	/// </summary>
	public class HexNumberValueProvider : ValueProviderBase
	{
		/// <summary>
		/// Contains code that will be called when recipe execution begins. This is the first method in the lifecycle.
		/// </summary>
		/// <param name="currentValue">An <see cref="T:System.Object"/> that contains the current value of the argument.</param>
		/// <param name="newValue">When this method returns, contains an <see cref="T:System.Object"/> that contains
		/// the new value of the argument, if the returned value
		/// of the method is <see langword="true"/>. Otherwise, it is ignored.</param>
		/// <returns>
		/// 	<see langword="true"/> if the argument value should be replaced with
		/// the value in <paramref name="newValue"/>; otherwise, <see langword="false"/>.
		/// </returns>
		/// <remarks>By default, always returns <see langword="false"/>, unless overriden by a derived class.</remarks>
		public override bool OnBeginRecipe(object currentValue, out object newValue)
		{
			newValue = null;

			if((currentValue == null) && (this.ExecutionStage != Stage.OnBeforeActions))
			{
				newValue = GetValue();
				return true;
			}

			return false;
		}

		#region Private Implementation
		private static object GetValue()
		{
			int number = CommonHelper.GetRandomNumber();
			return IntToHex(number);
		}

		private static string IntToHex(int number)
		{
			return string.Format(
					CultureInfo.CurrentCulture,
					"0x{0}",
					string.Format(
						CultureInfo.CurrentCulture,
						"{0:X4}",
						number));
		}
		#endregion
	}
}